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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3194456e5c5d72b62a8e17ec819a88f0fb61f1452f495c74a9336870552708c8' 
  AND token = 'bL5F7Zilv/83hfBtvBqaLQRtQJuucPGI27eqcJF8sh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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