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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecd186b1b1e44f0b44c135b16bf7590a6c3724c935e7dbff9e641c8d433ab3e' 
  AND token = 'uorBb5Hny9vCtcV5NLlBelGFfMg4xxymXVJNMSG0hI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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