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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168304b8d56af6edd7fccbae93ce74df064fa387bc9251656bfd77304a62819d' 
  AND token = '3u+t5UgejGmocjvdnmx/kTKl13kMc5GXJKTfod247v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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