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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2651cff0d60e3d6cb0a3dab944c4ba6b9f7d237cbb71fe3b0c1345c7a4f5cc' 
  AND token = 'sZLJ2dsF78/scCIJ36opgQ56e7NfVtIHNdxHHc4BNRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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