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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d0d0c229f1dd058a72fbe9a4efa66fdd566135406e4092e3ecf9ed1cfdd529' 
  AND token = '2sqKKNO8bgrMEJZI3htqLRZmoRRq1KQ2UXtsb38pkq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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