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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be94811977082df6ff7cda94e743d983a2b472d918d790889cb6448f9f1ec59' 
  AND token = 'LY+Mq5AWwV1oIiavUi2ZnxR6M8llmZKqIRIqtaBfQD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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