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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d39168edbe00daacd3321c144f28afd892b7d71957bf64d5887adb0392fb6c' 
  AND token = 'BaBlTNwsyZ95w3B6+v171m6V5DuaofSzjsg4Ogf/toM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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