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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82647fee510ac1f9f79e9a946dc6352b709466b10c7b8e3bf9571b0d1ee0c0e0' 
  AND token = 'X+4WJ+s0okJmL8bq310mfnDTQan9FJKO8m1FDlO/Ojo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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