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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8c30a35b8a7fbc0c5ec6f7292bcf9f4877601a104090f888e055cb0ccfeb10' 
  AND token = 'GgrMuQYFQeqzs4V39FNwi68bzvcXV4solkPPAWiMtJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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