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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b0f5813231d2c8adb8230c6910ede903ccbb8d4ee49edc2a05932644501807' 
  AND token = 'jdySqb110l9CDbfm+ZwGlSVjm8vZz/wd/y1ZhGKnWRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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