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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6272dbed618c6945cd4340a187f1a2eb2e61c0127483f1a8d0635dc58c65d9' 
  AND token = 'a6e0Aq93SZr6twsX3m9hAPlaG/vBtNopbg27tMXOEtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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