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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee1f043ea0635901221ef155a6326c1605a337014462ba9651acbfc1916058c' 
  AND token = 'sNs7+E7BTJIBg9rASu5ySkB3QS5wP2anH5dYs1KGP08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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