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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ad36dab4c367c29c4db7b151bdb1150e3ed09562e10a7ee9336a272563bde3' 
  AND token = 'tWjLbcgXoqefrrh4SSGGtht1LlAVlyxZAEobk20ZUo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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