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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700ccfd754f296134766efa98101076ae9df9f57031a9258bfcd7f443b49fbb2' 
  AND token = 'fPg5P9Opa0wWkdhlqO35SQDHQv9RelEdhRTMd+fxqo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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