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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6849385b20bcb45d50e61f3559d734c40949e42cf3ed64c81dd7c9addeb7b6bc' 
  AND token = 'kfSZiX23xOZRFdDHDpXzlOMF8r3JR/prF2ZoOzTwplc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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