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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be8ac5f6708a0872ce0faa7e9974edfb6d52d74493dbff1583e4f93801f0ed4' 
  AND token = 'sUPyh/e/Gb3tfma2Ki5vPoPJQ8v6ws+MDtckvr9d3UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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