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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d1b878f4e340126309f2b3a3ddfdb0caed1b3872a4cc0b927f62f08bdcd714' 
  AND token = 'K5QDS2YRB88t7jz/oS1WoeViLlL/Q/8VjsobFFZUHRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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