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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f53014342b7ce9d667a614c583628750a4c0ab7bb5812c17a3bd72270c3a3c9' 
  AND token = 'w/LPm+OedFExApicjHzW/eEqC3kHqTICm6y+Xua+tpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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