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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7d0bab58e285bb05483107fe6a70d63504c92ad14ab2db64826fef02e6e2c1' 
  AND token = '6rlnL8y3NWFjMbXOO3MhJ3mFY9f+7T0LXmYuf5neI3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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