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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94a8a6162d242f9501eddf2acb91332698fb4b76fb4424675891680a025c7ed' 
  AND token = 'eNf/7F0fPHNg7rsnTwQccKsnoj7vI6P4SeWlpyyugZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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