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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef31cfa9d284ad0a5c5b17ff277d1b61507cf58795a1300c66e8e38a2d1fdb6c' 
  AND token = 'Dq+btt4RvpfcqUcIV7R1cPlEuTiBH4EULWUudJ0fzGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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