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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf05a708ad67443e0900684c83395abeadf3a682965792f9e68d9feb75484f5' 
  AND token = 'GSI0yDFWIc85gZeb85xygZrkvGOqCDo0pkF+x+F6gp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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