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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2221675352e4311ed932ef2c2010f07d3c156f3634ca5530f97180e92dc9b98' 
  AND token = 'H0eBRu3n6t1WWszU6BefvzAgxQPsFttxx0EMPIH6UKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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