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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32399353ce1d4312e1845f30f9e27306810502d73a0cd71b1e64cca137ec8ac6' 
  AND token = 'qhP3lQ2Bz/lORFyQ48XOR8asyt30t9dP6ySk6QA6B18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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