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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9cfab7bf12dacbceb27b48ce482ec3754375ef243eac5d134f138888dde1de' 
  AND token = '5BWwSPMfjHj5zj9+MNTaWLqUdtAv1Z1RlqMvkzFPVCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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