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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878cfe366d591abbf9774451b0f40f138826355a52321c5a34cd8cb08e393a06' 
  AND token = 'e6PfgPlkscBHH5MTZPJpBb1JGVVmcpiVkGMgCpCZQbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}