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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4568dea9d4d45801a4285cd3f088534b30fd9ab8d04b32c3796c874cbdc6ea9d' 
  AND token = '1C9NutdPh3j8ZeApGEdkqnBeA5+QuKAXzPW6RzGV2kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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