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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674a32257ab0e7012a184765010292b802793e881c5fa8d23069e57579912013' 
  AND token = 'Kh59TQaax14HUaMlXqo38k6qVLbej3a1YQek+TaW34Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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