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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f11fcf10958b1942a59681d34d02c26980ce98f624230650c709ff5c9185d4' 
  AND token = '1dKIIWkRantaNFAFWxtaZjPGrcI9DFex+VFZzAed9Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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