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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817b68d2334eaabeff6b8387d0bffc269ffe2d7659b804fdc9296f531620fc00' 
  AND token = 'MuIRGjpaJmUWP2R4re5yuEgds4Zd+ZJr2z7PBB2eJFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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