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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62c4a8d6428b53da678cfb289a800b0c6dac69eedf0f3e640b5a038990b0542' 
  AND token = 'l8iA6LNIulwjRE627SkZts0Td32scU4xuQ+DK4yavVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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