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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616748ce275fb0d8b1915485fbe9da58316004bb53d333e53f008057e0125217' 
  AND token = 'CD2e5jP0NovHz0YH/P1jk1d8522EJ9J4bIUwE2ZWz5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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