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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04b89eef21c60682f7931dad210bcf7ce1380912d21cd1fc7caedf79fb28db8' 
  AND token = 'UN48inah/SDGCoheq0X+zjADGjLSEYWviEjOufuULEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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