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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a255512806f9d1c04c18180dfed698b3d7ed63de421fe7e9786e7ffdf59b69' 
  AND token = '45DQbTU7Mg+Sr9luzp1sapxrWIDRZV26YhPCbV5vcWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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