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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bd3417574090a0433fc309b49de64f31fbe3839fb39ef32743ec600e8e04a5' 
  AND token = 'Ta791FgEnKzwAYvx3BQ4blocB/GDmDlgTrq8AfeOtm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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