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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081092488a0b5b5548f5a7b01dfe9ee4121680c6bf7469371d48cd4cece6017a' 
  AND token = 'j6aAytqu2MAsK2KWrF5obRb1P9cbyPLhdNzRMF3xtH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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