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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0831585d32c222952866b857ecbcf76c04c7ed8779a9dc4459df7677635a990e' 
  AND token = 'zK4jSnmK6NlOVi+RiBXmbWI+MMwoyirsnGkuiVr1O50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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