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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13b653b68b4a98c7fca433dd30aa57c54323bc4a12c65c0826f83b927550f8f' 
  AND token = 'PpThODGqR5Wyfdv81xEmL5legeGNum/WEmHjmNBPA4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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