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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e468746a944c9dcdd6a7049b3defc3591f28172af2a2747823b55d99eadbf1d' 
  AND token = 'lr/i6BI05lhr77dsq/1o/JCsTjLJ73MpDVNF/dhY3fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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