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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b94591f7b3c1bfb71aa97aff1e92830e3a5a0a422b4d1025ea810ec9ad01b9c' 
  AND token = 'resDrLJCU2beAI2bf4sNO4DDAKZOjEvqckT7vlnp720=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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