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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e116b7e08301c7a54fe72c7ca47f7247895f929b2323a6c8dfe693b4afd4f5e' 
  AND token = 'n38F/fcqX4CXu7nKl0RhycCyTRJTStoS+Neu5dsN8Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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