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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d6df7b90628bf897e62c72df1228038fa9b28aa9de2ce778d5cf757f543044' 
  AND token = 'hbHE6T015rkzkOBZKyZ2nU/Jce7+4AzQCOlnAbODW3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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