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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22edf11ccee5edf616f1a247d28ca174a79de1925be15b7301c4b3d4297520f' 
  AND token = 'cvR6cslxhzHpHt6kDccsA+qD1o+Tmf0cR9o97gLMs7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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