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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02e4be2faa3ad7029ef91caa0521fc4c63c4389d0f19ebab4f6b179d12e6156' 
  AND token = 'dCZ4uPEgCfflGUfA3h54iHZJ1ijnV3PDhvNP6MxD+04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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