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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269ccda78d1406097a0ef1fc4a5e4fda3bd5288f8345a3f26eb91e8ec25fd7c4' 
  AND token = 'ANFG8vak7G2ooo5YHWHchVUVCW4qNCpVSA1/98+E5i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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