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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2c948703efced0736110797c6653c4835246ba430c5339df17eca7fd6a3a66' 
  AND token = 'KaQBMBNPXOyIfCh3CM3JSjmrt8gv+b4oD8n9ndmE/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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