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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e804bdcfc32a37714486f8b7699eaddf6528111b262cac0e787e1fdc70c61' 
  AND token = '6Xm5RY9nJLTwEBvR5bYEveTW0VU14F5237OiuGryFk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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