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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688416e251fb16d20fd120cc3e801880b569afd598769f25ee8e3735e65f9a05' 
  AND token = 'fuIsyRtA5iiTJV+KYoyfcKXWWthY+CJcfWOlst+6psg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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