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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ba74ae1d54a1af36e441d47aee26f42d20ae3afe596d51fc971f42258c8b07' 
  AND token = 'FIMYHS+if0b3L9ywSEMR29jdKRCfWcu+mA409+t9IiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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