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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d900a6e984e63fbfdc7db8d3e8921fd08b3fad03e3702160478c7f59a760a75' 
  AND token = 'hd4amNuZ7ymwOqMU9clJ0aBaan0tGh4N56d3rTzEM2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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