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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec55dcd11e40860d2c3d98666e70c29d4e5a8dc03841e82818089c3e582a3372' 
  AND token = 'DOe7GpqqN0cbSogoCYaH8nDadMw8Z5Y7X90tnNJ/aQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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