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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8fce234452dc0999d45e0ef28a6ceb648acf2355b324ce9ea7724931363c6c' 
  AND token = 'u/QPWI4TVePqxb7xa1T2t4VHuVYO5yMidZwvWIqrJuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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