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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1a575fc0fc9adc57c247c9cea7aeea26d6804566d2348cb217159adb6b0a51' 
  AND token = '4rXNr54M3o9HGxiwmJVvapNHASEKB86F6UzCzzJxamw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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