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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddabdc7579e1c8f2445c64ddf8f6872d0a652275e68e19119e2bac4cfbbfb4c2' 
  AND token = '6FMxzIZYr47cnjGUSO5NFlcnSotEj5Cs0AdG1/wd4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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