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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badd85d9055bf4a761ac7c8ca5560800e59d7974e7f9fdfcfa4e219ff65a5e6e' 
  AND token = 'jojw+kLaIIsSWUSHU8k32hqpaqVTHvDt+5LJ2ZC95Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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