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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b93873cf2348e4f9bab1875df7261fb557be5fc8498987f4dd8e5e680a71ac1' 
  AND token = 'wPywa0gg7qO09V9sHR1NafF6OqAUnd3kn0eTAsugx2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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