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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4d598763f7b067bd52b436a8ed045235cddf1e3d8ec95f88ad7b58cf461c83' 
  AND token = 'jvX4Qb8JWLnkgIeUXNFZL/u8d1PDo8idr/1x621510A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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