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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecdada0d770fb6c766c8131fa4a7cc12e529cd561c2be2158a37af6f0f3e57d' 
  AND token = 'm8MDnrDrtJrVQmQVB6y8NuXn7skqD2CiMFS+vIv4AF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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